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Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Patrick wrote ... So, if at 23 C degrees, Ohms = 200M, and then 45 degree C rise above that.... so i gain ~0.500% of 200M just from temp rise?
Yup. On the datasheet, TCR means "Temperature Coefficient of Resistance" to distinguish it from, say temperature coefficient of mechanical expansion. A copper wire gains about that much resistance (0.4 %) for a 1 degree C rise. The ROX series includes R's with guaranteed TCR ratings of 200ppm, 100ppm, and 50 ppm; perhaps the latter are not much more expensive.
Also note that the datasheet gives a Voltage Coefficient of Resistance. Looks like at 10 kV per resistor, its resistance would be down by at least 4%. Remember, Ohm's "law" is a just a very good approximation for behavior of many real materials in a widely useful range of electric field strength and current density.
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Temperature Coeffcient for a Resistor, 100ppm.....
